Question

An electric lamp which runs at `100 V DC` and consumes `10 A` current is connected to `AC` mains at `150 V, 50 Hz` cycles with a choke coil in series. Calculate the inductance and drop of voltage across the choke. Neglect the resistance of choke.

Answer 1

Correct Answer - A::C
`V_L=sqrt(V^2-V_R^2)`
`=sqrt((150)^2-(100)^2)`
`=111.8V`
`V_L=IX_L=I(2pifL)`
`:. L=V_L/(2pifI)=111.8/(2pixx50xx10)`
`=0.036H`